Finishing electric-lamp bulbs.



N11; 329,539. PATBNTED AUG. 28, 1906 G. P. MODONNELL. FINISHING ELECTRIC LAMP BULBS.

APPLIOATION FILED SEPT. 1.1905.

Witnes In vanhor: agm -iqwig George P. M Donnell 4% Q ipww'v za MWQW A MB'H'S.

UFFICE.

GEORGE P. MGDUN V ELECTRIC COMPANY, OF EAST ORAN 111., NEW .1 ERSEY, A CORPORATION OF NEW JERSEY.

FlNlSHING ELECTRIC-LAMP BULBS.

Specification of Letters Illatent.

"w en Aug. 28, 19GB.

Application filed Sop'wmbcr 1,1005, Sozigl N0, Tic/Jil n To all whom it may cox-acorn.-

Be it known that I, mono-x P. Mcllow NELL, a citizen of the United States, residing at St. Louis, Missouri, have xiv-related a cor-- win new and useful 1m I'ovcmcnl; in hit-thin is of Finishing Eleomric- Jcmp Pm o, of which the following is a full, clear mm cxncc do scription, such is will cnchlo (who? skilled in the art to which it appcrtoi'cs to make and use the some, reference being heel to the cccompanying drawings, 'fornuog purl oi this; specification, in which Figure 1 is an clevotiomal VlG'W of 21 n apps,- ratus for carrying out my mcihod .l-L i2 an enlarged detail sectional View Show. finished and of the lamp or bu Fig side elcv'ct'ionol view showing 2; end of the lamp or bull This invent-ion rclcioe:

method of finishing elm V 1 ob ect helm, to remove allc ch teat resulting from tho closurc 4 ture.

The present invonthm. is improve can upon the method disclosed in Um. Patent No. 793,211, dated June granted upon an application filsfd My present invention consists. l in passin a current of eleciricity 11 mzgh' carbon fi lament; at the time the tool )3 coinsubjected. to the fusing hoot, in as to rod: the rescurc inside of the bulb and b prvllm.-- nel'i y hcsxting the hull) and 'L avoid cracking cf the glass forming Ll In the accompanying drawings hove shown an improved form of apparatus for carrying out myprescnt invention; but it is obvious that other apparatus could he employed.

1 is a baseupon which in mountcd a wi tical rotary shaft 2, having a pulley 3 :lri by a suitable source of powcr---os for instance, a belt 4. The shaft carries at like; upper end a frame 5 formirg a lamp sockcl and S11 )port 6.

I). order to pass an elcc 1511c cuncni; through the filament in the bulb m the time the nulh and through the l11mp-.\c;; ri he in r W- trio-cl connect, with hc brace has; or collar l 1 of Lhe lump. A rhcoemt- 11mg; be plocml in the lnmycn'cml. to out in or cut out resictonce in. Lhccrcui i, so as to control the amount of formant supplied to the filament at the will o the opcmtor.

l n (spmel lull ulhi-l the lamp placed in poeiiiou th cum'vui' mrnvd on. so as to heat gle: s of th? lmlh and its; tool and also to expend siach residual gases as: may be left in the bulb and to increase the pressure in the bulb. When this has been accomplished, it rcquirmg but a very short time to do this, the home rotated, the tool being practically in mincidcnce will: lhe do of rotation, and the F the male l3 directed Lhcrc- :ospfwrlv pm on) Fol'cvs the some hm an; rim rcsinlzml gesoe manic of have hocn lumlml. ma external pres gixre nic'lr'lm time, is not cxcessive, f c thaw rendered less son-- cw. mm cons-e4 uenlxly illo sinking; in concisely, as ulal he mo misc wcre the gloss cold and a. high. vacuum mcjnicincd inside Lhc lamp, the Le l A slowly until the ports assume the own in Fi 2. The rotation of l is lumtcd the to the sinking action before cpguoeronco of a coun- -he ro c'oood orijion projected [he pcripnercl low of the Fig. 33.

51:25 deco; ihcd the invention, what is as new, and desired to be secured l1; Lethe? P vcu t, ie--- 1. The horeiwdcscrlbcd method of finishlog elm-iris hump hull; on which the tea-l: has lawn formed the Rome coneisfin I in first passing on lx'fiill'lU current tllmugl the carbon filanwzu a c; w hoot the residual gases and the gloves of tho bulb and its tent, then up lying heat to m teat o1 i-hc lam J-hUlb, w lich hull: hue fi st lumen oxh mslerl, and at the more time Punting;- ihc lamp or hull); sub" mc ol iolly es rleecrilml,

jog oloctriolmn bulbs on which the Lent has been Formed. w uch consists 1] first passing an clcctric cur-rout through the carbon hlamcol so are to heat tho residual gases and the 3. The herein-ocscribed method of finish- 5 sink substantially within thv I0 an electric current than suhjvcting said tvnt only to the action of heat externally applied and at the same L tinm rgtzmng thv lmnp or bull) and finally thu tout to l annealing the same; substantially as delass of the hull) and its tent, which hull) has l first been l-xhuustutlf, and than playing it flame on tho tent of the lmlh mul pul'mitting atmospheric plgissurv to cause lines, 0F the 1 Swllflll. lump or bulll; substantially as (luscrilml. v in testimony wlim'm'il' l hereunto allix my 3. The hvmin-dcscx'ibm method of finish.- signature, in the pi'csvnun of two witnesses, ing electriclamp hullyq on which thv teat has i this 25th day of August, 1905.

been formed, which consists in first passing through the cai'lmn film went so as to lowe'r the vacuum therein and l at the same time heat the glass of the bulb and itshteaut which bulb hits first been exhausted, l

GEORGE P. MGDONNELL.

\Nitnesses:

F. It. (TQRNWALL, (10m BADGER. 

